Punch



Dec. 13, 1932. H. c. SPENGLER PUNCH Filed July 6, 1931 EN NN MN NN mwN Patented Dec. 13, 1932 UNITEDv STATES HAROLD o. SPENGLEB, or Rockman, ILLINOIS PUNCH Application med July 6, 1931. Serial No. 548,972.'

This invention relates to a new and improved form of hand lever metal punch.

Thel principal object of my invention is to provide a powerful and easy working punch 5 of simple and economical construction, and one which provides for positive withdrawal of the punch after the hole is made, instead of relying upon a return spring for that purpose, the use of which has certain practical objections.

Still another obj ect is to provide a punch in which the unthreading of a pivot pin is arranged to permit rearward displacement of the intermediate punch actuating lever from its normal operative position so as to allow removal and insertion of a punch.

A further object is to provide a punch in which the hand lever is permanently connect- D. ed with the intermediate punch actuating le- '0 ver, thereby always insuring positive operation of the intermediate lever and avoiding any trouble due to these parts getting improperly vrelated to one another in the operation of the punch, as for example, when the hand lever is moved to an extreme position, besides permitting the intermediate lever to serve as a limiting stop for engagement by a portion of the hand lever when the latter is moved to the eXtreme vposition referred to.

The invention is illustrated in the accompanying drawing, in which Figure 1 is a side view of my improved punch showing the same closed, certain portions being shown in central vertical section for the purpose of better illustration;

Fig. 2 is a similar view of the punch showing it open; j

Fig. 3 is a front view of Figure 1 with certain portions appearing in vertical section;

Fig. 4 is a fragmentary view similar to Fig. 2, but showing the intermediate punch actuating lever movedto the rear so as to expose the punch for easy removal and replacement, or substitution of a new punch, and

` Fig. 5 is a sectional detail 0n the line 5 5 of Fig. 2. i

rEhe same reference numerals are applied to corresponding parts throughout the views. 50 The punch comprises a head 5 provided on the front end of the handle 6 and formed so mediate punch actuating lever 15, at f the as to provide an upper jaw 7 and a lower jaw S. A punch 9 has a close working t in the hole 10 in jaw 7, and is arranged to cooperate with a dievll threaded in a hole 12 provided in the "lower jaw 8, whereby to punch holes 55 in the metal entered between the jaws. A T-head 13 is formed onithe upperend of the punch 9, to ,fit inthe T-shaped longitudinal slot 14 provided in the 4bottom-.of an interfront end thereof. The lever 15 has a transverse hole 16 in the rear end thereof through which a pivot pin 17 is arranged to be eny tered to pivotally support the lever between the ears 18 suitably formed integral with the head 5 at the back thereof. The pin 17 lis threaded in one of these ears, as indicated at 19 in Fig. 5, and has an enlarged knurled head 2O arranged to permit the threading or unthreading ofthe pin in the handle for a purpose mentioned later.v

A pair of side plates 2l are pivoted on the opposite sides ofthe -head 5 by means of a bolt 22 extending crosswise through the upper jaw 7 behind the hole 10, and having nuts 23 threaded on the ends thereof. A hand leverV 24 for operating the punch is pivoted on the upper ends of these side plates by a bolt 25 passed through the front end of the lever and through the platesand having nuts 26 threaded on the projecting ends thereof. The front end of the hand lever has a pair of downwardly projecting parallel ears 27 formed thereon receiving the front end of the intermediate punch actuating lever 15 therebetween. A roller pin 28, having a free turning iit in a transverse h ole 29 in the lever 15, is likewise receivedwith a freeturning iit in holes 30 provided in the ears 27, whereby to positively interconnect the levers 15 and 24.

In operation, when the hand lever 24 is moved from the position shown in Fig. 2 to that shown in Figure 1, it is manifest that the intermediate punch actuating lever 15 forces the punch 9 through the work by cooperation with the die 11. Conversely, when the hand lever 24 is raised from the osition shown in Figure 1 to that shown in Y* ig. 2, the lever 15 10 positively withdraws the punch 9 from the work. In other words, the operation of the punch is positive in both directions; there is no reliance upon the action of a spring to return the punch, such an expedient being objectionable because of the fact that breakage of the spring meant throwing the punch out of commission until a new spring could be procured and inserted. Furthermore, under certain conditions there was a noticeable tendency for the punch to stick where a return spring was used, and that meant considerable annoyance to the operator and slowed up the Work. The positive withdrawal of the punch avoids these objections and means not only a saving in maintenance expelled-there being no springs to replace, but also insures speedier operation. The desired power is securedby reason of the close relationship between the pivots 25 and 28 to begin with, and the fact that the farther the punch is closed, the closer the pivots 25, 2S and 22 approach alignment, thus increasing the leverage more and more (see Figure 1). The ease with which the punch may be operated is largely attributable to the fact that the lever 15, instead of being operated by the lever 24 through an interitting projection and recess on these parts, which meant considerable friction, is connected with the lever 24 by means of a full-floating roller pin fitting freely in said parts and therefore adapted t0 turn as occasion requires, thus minimizing friction. The pin 28 is kept in place by the side plates 21 so that no other means is required to serve this purpose. The pin stays between the plates in allpositions of the lever 15, as clearly appears in Figs. 1, 2 and 4, so that there is no chance for it to drop out.

When the pin 17 is Unthreaded, the lever 15 can be moved to the rear by means of the hand lever 24, as shown in Fig. 4. This leavesthe punch 9 fully exposed for easy removal and replacement, or substitution of a new punch, or one of a different size. In this operation the pin connection between the levers 15 and 24 is of advantage because the levers cannot come apart and, hence, the work is simplified, there being no loose parts to handle. The fact that the lever 15 is detachable from the punch by rearward movement away from the punch while the punch is in position in the upper jaw enables providing for a closer working fit of the punch in its guide hole than could be provided for in other punches where the punch had to fit in its .guide hole loosely enough to permit it to be raised out of the hole by swinging movement of the lever to an inoperative position. Hence, closer alignment of the punch with its die is made possible and that naturally tends toward longer life and generally improved performance of the punch.

The positive operating connection between the levers 15 and 24 is of further advantage from the standpoint that it enables the limiting of the movement of the hand lever 24 in the opening of the punch, directly by the intermediate lever 15. In other punches not constructed along these lines, special pro vision has to be made to take care of this matter, and it usually involved extra parts and, hence, a certain amount of complication of the construction. In the present case, I simply provide a flat seat 31 in front of the bearing for the roller pin 28 on the top of the lever 15 and form a flat nose portion 82 on the front end of the hand lever 24 to engage said seat when the punch is fully opened, as illustrated in Fig. 2. In punches relying upon spring return of the intermediate lever and having a detachable operating connection between the hand lever and the intermediate lever, consisting, for exd ample, of a projection on the intermediate lever engaging in a recess in the hand lever, f

failureA of the spring means to return the intermediate lever upon raising of the hand lever, due to sticking of the punch or breakage of the spring, would invariably result in the hand lever becoming detached from the intermediate lever. That annoyance is entirely eliminated in the present construction by reason of the positive connection between the levers which insures the raising of theintermediate lever upon the raising of the hand lever, and the hand lever can be raised only so far as limited by engagement of the nose portion 32 with the seat 31.

I claim:

1. In a punch, a handle having a head thereon providing upper and lower jaws, a punch guided in a hole in the upper jaw, a die for cooperation with the punch mounted in the lower jaw in axial alignment therewith, side plates pivotally connected to the f jaw of the head on opposite sides thereof, a hand lever pivotally mounted between said side plates above the head, an intermediate lever for actuating the punch pivotally mounted on the head and extending forwardly between the side plates and operatively connected at its front end with the punch to communicate movement thereto, said hand lever and intermediate lever being arranged to be connected by means of projecting ears i on the front end of one of said levers receiving a front portion of the other lever therebetween, and a full-floating roller pin freely received in registering transverse holes provided in the interengaging front fllO removability and serving to detachably pivot the rear end of the intermediate lever to the head, whereby said lever may be moved rearwardly from normal operative position, the connection betwen said lever and the punch being detachable by such movement of said lever, and wherein the side plates are further constructed and arranged so as to cover the end of the roller pin in the retracted position of said intermediate lever, whereby to hold the pin against endwise movement out of the holes.

In witness of the foregoing I aiiix my signature.

HAROLD C. SPENGLER. 

